public const int SettingSize = 6; // 2 bytes for the id, 4 bytes for the value.
public static bool TryReadFrame(ref ReadOnlySequence <byte> buffer, Http2Frame frame, uint maxFrameSize, out ReadOnlySequence <byte> framePayload)
{
framePayload = ReadOnlySequence <byte> .Empty;
if (buffer.Length < HeaderLength)
{
return(false);
}
var headerSlice = buffer.Slice(0, HeaderLength);
var header = headerSlice.ToSpan();
var payloadLength = (int)Bitshifter.ReadUInt24BigEndian(header);
if (payloadLength > maxFrameSize)
{
throw new Http2ConnectionErrorException(CoreStrings.FormatHttp2ErrorFrameOverLimit(payloadLength, maxFrameSize), Http2ErrorCode.FRAME_SIZE_ERROR);
}
// Make sure the whole frame is buffered
var frameLength = HeaderLength + payloadLength;
if (buffer.Length < frameLength)
{
return(false);
}
frame.PayloadLength = payloadLength;
frame.Type = (Http2FrameType)header[TypeOffset];
frame.Flags = header[FlagsOffset];
frame.StreamId = (int)Bitshifter.ReadUInt31BigEndian(header.Slice(StreamIdOffset));
var extendedHeaderLength = ReadExtendedFields(frame, buffer);
// The remaining payload minus the extra fields
framePayload = buffer.Slice(HeaderLength + extendedHeaderLength, payloadLength - extendedHeaderLength);
buffer = buffer.Slice(framePayload.End);
return(true);
}
